A decentralized exchange (DEX) built on an AMM (automated market maker) puts two assets (a trading pair) into a single pool of funds (a liquidity pool) and uses fixed rules—such as the "constant product" formula—to calculate swap prices automatically.
The deeper the pool, the smaller the slippage and the easier it is to get trades done; when the pool is too shallow, the opposite is true. That is why liquidity providers (LPs) are needed to supply liquidity.
What Is LP?
LP stands for Liquidity Provider: users who deposit a trading pair (e.g. ETH/USDT) into a DEX liquidity pool.
In simple terms, someone has to put their tokens into the pool so it actually has liquidity. That way others can trade smoothly; otherwise trades may be hard to fill or prices may move sharply.
What Is an LP Token?
In return, liquidity providers (LPs) earn a share of trading fees, and some platforms also offer extra rewards.
After you successfully add liquidity to a pool, the protocol usually issues an on-chain asset commonly called an LP token. When you want to withdraw liquidity and get your assets back, you redeem (burn) the LP tokens and receive your proportional share of the pool's assets.
Why LP Lock Matters
LP lock means locking LP tokens in a smart contract so liquidity cannot be removed before the lock expires. That prevents the team from immediately pulling the base assets out of the pool, eases fears of "add liquidity then rug," and gives token holders a promise that can be verified on-chain.